I've written up my notes on network booting the sevenx OMAP3 StageCoach board here: https://wiki.linaro.org/MichaelHope/Sandbox/StagecoachBringup

I'm not currently using the Linaro kernel as either need a kernel with USB Ethernet and NFS root built in, or a way of combining uImage and uInitrd into one. Perhaps next week...

-- Michael